The 10 year old iCN510 is just a rebranded Mio 136 (Pocket Pc) running windows ce (4.20, I think). Navman installed their GPS software and locked the system.
It can be unlocked, I am almost sure, but I never did it myself. In the past, there used to be a website about unlocking all Navman devices, however it has folded.
Not sure about this, but their "MOOV unlock" could be the one they used to unlock the 510. If you can find it.
What should be possible to find on the Internet is miopocket. (google)
Miopocket is a heavy program that weights on the devices memory, so it may not be the best choice after all.
Then there is "danibor lanik" who might have an unlock that works.

I have been asked by a friend to see if I can get their Navman S50 working again so it is actually useable, with AU/NZ maps. I have read a lot about what needs to be done but I must be missing something simple and would appreciate confirmation of the details. So far I can connect via usb and copy files but, no matter what I have tried, all I get is the flash pic (lady with head out of a car) showing S50.V1.50.0010 across the top, NAVMAN S50 in the middle and Smart ST TM at the bottom. This screen then swaps for two boxes and a usb symbol with either a two way or single way moving chain dot graphic depending whether it is plugged into the PC or not.

I have plugged an 8Gb microSDHC card into the GPS using a Micro SD card adaptor, and FAT32 slow formatted the card via the GPS. When plugged in via usb the GPS and SD card show as separate drives and files copy easily to either. I have copied the original Navman files off to an external drive and deleted them off the GPS.

Whilst I note comments above saying the pack links in 16 & 17 don't work is the same for me, what I have collected and extracted so far from around this forum is the following:

A) Program Files in post 1 here (399Mb on an NTFS disc) which has two directories being Common Files and Navman, and no separate files

B) [Hochladen.to Dateien - Files kostenlos hochladen]AUS___NZ_-_WhereIS-2014.Q4 (the maps, 266Mb on FAT32) which I do understand need to go in the relevant folders in the content directory.

C) unlock light.rar and Minishell_CLASIC_New_Flash_v1_320x240.rar from posts 16 & 17 which I have done nothing with as the pack file links don't work and I expect they are needed together.

E) iGO+Primo+2.4+9.6.13.405512+(June+2014) (189Mb on an NTFS disc) which has 3 directories being content, license and ui_igo9, plus 11 files

Original GPS files (136Mb on an NTFS disc) which has 4 directories being Navman, Program Files, PIM and My Documents, plus 4 files.

The GPS Memory capacity is reported as 444Mb by Win 7's Explorer and the SD card at 7.59Gb; both have a volume label reflecting owners name, which shouldn't be a problem? But I obviously have the problem that A) + B) above won't all fit on the GPS. I have tried putting them on SD card (with maps in correct directories) and also on GPS but no maps and the start-up is unchanged. I have added original root files back to no effect.

What I struggle with in my ignorance is I don't see how the GPS is told what to boot as, following the instructions EXACTLY, all there is in root of GPS is Program Files directory. Supposedly (from another post here somewhere) the SD card is a priority boot so I could have iGo Primo on SD card and the original files on the GPS and it would boot to the SD card first, or the original if SD card removed, which sounds a pretty sensible arrgt.

So far I have done nothing with the two iGO Primo files in D) and E) as it is even less clear what to do with them, and they too add up to more than the GPS memory when maps are added in. Could somebody kindly please explain how to put this jigsaw together so it works? Thank you.

Did you read this thread and found no solution?
Then this may be useful, but I do not guarantee it works. Some (long) time ago, Corsea wrote:

My friend had an old Navman S30 he wanted to install Igo on. It was actually a quite simple process.
First back up the contents of the flash disk to your computer in case anything goes wrong.
Find the folder called Program files in the flash disk.
Inside this is a folder called Navman which in turn contains another folder called SmartST_CE and an application called AppStartupSec.exe
Delete the contents of SmartST_CE and replace them with the contents of the Igo folder ie content. licence, data zip etc ( In my case I used Igo 8.3.2.79297) ie the Igo folder is now called SmartST_CE. (or you could simply rename the Igo folder to SmartST_CE)
Rename Igo.exe to SmartST_CE.exe
Delete all the rest of the Navman crap to free up space (You might want to do this first)
You should now have the following structure on the flash disk.Program files / Navman / SmartST_CE (plus AppStartupSec.exe) / (Igo files)
The device will now boot straight into Igo after the initial splash screen.

To make backlight work properly, I have been messing around in system text and have put in the following under power.

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